<?xml version="1.0" encoding="UTF-8"?>
<dxl:DXLMessage xmlns:dxl="http://greenplum.com/dxl/2010/12/">
  <dxl:Comment><![CDATA[
  Setup:
  CREATE TABLE t1_x (a xid) DISTRIBUTED RANDOMLY;
  
  Expectation: 
  Random distribution should not exists prior to INSERT. With
  optimizer_parallel_union guc on, and if there is no column in the base relation
  which can be hashed, a strict random distribution is requested which enforces a
  Redistribute motion on top of the append child. Since, there is already a
  redistribute motion on the childs of Append node, DML Insert should not enforce
  additional redistribute motion.
  
  Results: 
  SET optimizer_parallel_union = on;
  EXPLAIN INSERT INTO t1_x SELECT a FROM t1_x UNION ALL SELECT a FROM t1_x;
                                                QUERY PLAN
  ------------------------------------------------------------------------------------------------------
   Insert  (cost=0.00..431.01 rows=1 width=4)
     ->  Result  (cost=0.00..431.00 rows=1 width=8)
           ->  Append  (cost=0.00..431.00 rows=1 width=4)
                 ->  Redistribute Motion 3:3  (slice1; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                       ->  Table Scan on t1_x  (cost=0.00..431.00 rows=1 width=4)
                 ->  Redistribute Motion 3:3  (slice2; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                       ->  Table Scan on t1_x  (cost=0.00..431.00 rows=1 width=4)
   Optimizer: PQO version 2.70.0
  
  ]]>
  </dxl:Comment>	
  <dxl:Thread Id="0">
    <dxl:OptimizerConfig>
      <dxl:EnumeratorConfig Id="0" PlanSamples="0" CostThreshold="0"/>
      <dxl:StatisticsConfig DampingFactorFilter="0.750000" DampingFactorJoin="0.010000" DampingFactorGroupBy="0.750000" MaxStatsBuckets="100"/>
      <dxl:CTEConfig CTEInliningCutoff="0"/>
      <dxl:WindowOids RowNumber="3100" Rank="3101"/>
      <dxl:CostModelConfig CostModelType="1" SegmentsForCosting="3">
        <dxl:CostParams>
          <dxl:CostParam Name="NLJFactor" Value="1024.000000" LowerBound="1023.500000" UpperBound="1024.500000"/>
        </dxl:CostParams>
      </dxl:CostModelConfig>
      <dxl:Hint JoinArityForAssociativityCommutativity="18" ArrayExpansionThreshold="100" JoinOrderDynamicProgThreshold="10" BroadcastThreshold="10000000" EnforceConstraintsOnDML="false"/>
      <dxl:TraceFlags Value="102001,102002,102003,102074,102120,102144,103001,103014,103015,103022,103025,103033,104003,104004,104005,105000,106000"/>
    </dxl:OptimizerConfig>
    <dxl:Metadata SystemIds="0.GPDB">
      <dxl:Type Mdid="0.16.1.0" Name="bool" IsRedistributable="true" IsHashable="true" IsMergeJoinable="true" IsComposite="false" IsFixedLength="true" Length="1" PassByValue="true">
        <dxl:EqualityOp Mdid="0.91.1.0"/>
        <dxl:InequalityOp Mdid="0.85.1.0"/>
        <dxl:LessThanOp Mdid="0.58.1.0"/>
        <dxl:LessThanEqualsOp Mdid="0.1694.1.0"/>
        <dxl:GreaterThanOp Mdid="0.59.1.0"/>
        <dxl:GreaterThanEqualsOp Mdid="0.1695.1.0"/>
        <dxl:ComparisonOp Mdid="0.1693.1.0"/>
        <dxl:ArrayType Mdid="0.1000.1.0"/>
        <dxl:MinAgg Mdid="0.0.0.0"/>
        <dxl:MaxAgg Mdid="0.0.0.0"/>
        <dxl:AvgAgg Mdid="0.0.0.0"/>
        <dxl:SumAgg Mdid="0.0.0.0"/>
        <dxl:CountAgg Mdid="0.2147.1.0"/>
      </dxl:Type>
      <dxl:Type Mdid="0.23.1.0" Name="int4" IsRedistributable="true" IsHashable="true" IsMergeJoinable="true" IsComposite="false" IsFixedLength="true" Length="4" PassByValue="true">
        <dxl:EqualityOp Mdid="0.96.1.0"/>
        <dxl:InequalityOp Mdid="0.518.1.0"/>
        <dxl:LessThanOp Mdid="0.97.1.0"/>
        <dxl:LessThanEqualsOp Mdid="0.523.1.0"/>
        <dxl:GreaterThanOp Mdid="0.521.1.0"/>
        <dxl:GreaterThanEqualsOp Mdid="0.525.1.0"/>
        <dxl:ComparisonOp Mdid="0.351.1.0"/>
        <dxl:ArrayType Mdid="0.1007.1.0"/>
        <dxl:MinAgg Mdid="0.2132.1.0"/>
        <dxl:MaxAgg Mdid="0.2116.1.0"/>
        <dxl:AvgAgg Mdid="0.2101.1.0"/>
        <dxl:SumAgg Mdid="0.2108.1.0"/>
        <dxl:CountAgg Mdid="0.2147.1.0"/>
      </dxl:Type>
      <dxl:Type Mdid="0.26.1.0" Name="oid" IsRedistributable="true" IsHashable="true" IsMergeJoinable="true" IsComposite="false" IsFixedLength="true" Length="4" PassByValue="true">
        <dxl:EqualityOp Mdid="0.607.1.0"/>
        <dxl:InequalityOp Mdid="0.608.1.0"/>
        <dxl:LessThanOp Mdid="0.609.1.0"/>
        <dxl:LessThanEqualsOp Mdid="0.611.1.0"/>
        <dxl:GreaterThanOp Mdid="0.610.1.0"/>
        <dxl:GreaterThanEqualsOp Mdid="0.612.1.0"/>
        <dxl:ComparisonOp Mdid="0.356.1.0"/>
        <dxl:ArrayType Mdid="0.1028.1.0"/>
        <dxl:MinAgg Mdid="0.2118.1.0"/>
        <dxl:MaxAgg Mdid="0.2134.1.0"/>
        <dxl:AvgAgg Mdid="0.0.0.0"/>
        <dxl:SumAgg Mdid="0.0.0.0"/>
        <dxl:CountAgg Mdid="0.2147.1.0"/>
      </dxl:Type>
      <dxl:Type Mdid="0.27.1.0" Name="tid" IsRedistributable="true" IsHashable="false" IsMergeJoinable="false" IsComposite="false" IsFixedLength="true" Length="6" PassByValue="false">
        <dxl:EqualityOp Mdid="0.387.1.0"/>
        <dxl:InequalityOp Mdid="0.402.1.0"/>
        <dxl:LessThanOp Mdid="0.2799.1.0"/>
        <dxl:LessThanEqualsOp Mdid="0.2801.1.0"/>
        <dxl:GreaterThanOp Mdid="0.2800.1.0"/>
        <dxl:GreaterThanEqualsOp Mdid="0.2802.1.0"/>
        <dxl:ComparisonOp Mdid="0.2794.1.0"/>
        <dxl:ArrayType Mdid="0.1010.1.0"/>
        <dxl:MinAgg Mdid="0.2798.1.0"/>
        <dxl:MaxAgg Mdid="0.2797.1.0"/>
        <dxl:AvgAgg Mdid="0.0.0.0"/>
        <dxl:SumAgg Mdid="0.0.0.0"/>
        <dxl:CountAgg Mdid="0.2147.1.0"/>
      </dxl:Type>
      <dxl:Type Mdid="0.29.1.0" Name="cid" IsRedistributable="false" IsHashable="true" IsMergeJoinable="false" IsComposite="false" IsFixedLength="true" Length="4" PassByValue="true">
        <dxl:EqualityOp Mdid="0.385.1.0"/>
        <dxl:InequalityOp Mdid="0.0.0.0"/>
        <dxl:LessThanOp Mdid="0.0.0.0"/>
        <dxl:LessThanEqualsOp Mdid="0.0.0.0"/>
        <dxl:GreaterThanOp Mdid="0.0.0.0"/>
        <dxl:GreaterThanEqualsOp Mdid="0.0.0.0"/>
        <dxl:ComparisonOp Mdid="0.0.0.0"/>
        <dxl:ArrayType Mdid="0.1012.1.0"/>
        <dxl:MinAgg Mdid="0.0.0.0"/>
        <dxl:MaxAgg Mdid="0.0.0.0"/>
        <dxl:AvgAgg Mdid="0.0.0.0"/>
        <dxl:SumAgg Mdid="0.0.0.0"/>
        <dxl:CountAgg Mdid="0.2147.1.0"/>
      </dxl:Type>
      <dxl:Type Mdid="0.28.1.0" Name="xid" IsRedistributable="false" IsHashable="true" IsMergeJoinable="false" IsComposite="false" IsFixedLength="true" Length="4" PassByValue="true">
        <dxl:EqualityOp Mdid="0.352.1.0"/>
        <dxl:InequalityOp Mdid="0.0.0.0"/>
        <dxl:LessThanOp Mdid="0.0.0.0"/>
        <dxl:LessThanEqualsOp Mdid="0.0.0.0"/>
        <dxl:GreaterThanOp Mdid="0.0.0.0"/>
        <dxl:GreaterThanEqualsOp Mdid="0.0.0.0"/>
        <dxl:ComparisonOp Mdid="0.0.0.0"/>
        <dxl:ArrayType Mdid="0.1011.1.0"/>
        <dxl:MinAgg Mdid="0.0.0.0"/>
        <dxl:MaxAgg Mdid="0.0.0.0"/>
        <dxl:AvgAgg Mdid="0.0.0.0"/>
        <dxl:SumAgg Mdid="0.0.0.0"/>
        <dxl:CountAgg Mdid="0.2147.1.0"/>
      </dxl:Type>
      <dxl:ColumnStatistics Mdid="1.20432.1.0.0" Name="a" Width="4.000000" NullFreq="0.000000" NdvRemain="0.000000" FreqRemain="0.000000" ColStatsMissing="true"/>
      <dxl:RelationStatistics Mdid="2.20432.1.0" Name="t1_x" Rows="0.000000" EmptyRelation="true"/>
      <dxl:Relation Mdid="6.20432.1.0" Name="t1_x" IsTemporary="false" HasOids="false" StorageType="Heap" DistributionPolicy="Random" Keys="7,1" NumberLeafPartitions="0">
        <dxl:Columns>
          <dxl:Column Name="a" Attno="1" Mdid="0.28.1.0" Nullable="true" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="ctid" Attno="-1" Mdid="0.27.1.0" Nullable="false" ColWidth="6">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="xmin" Attno="-3" Mdid="0.28.1.0" Nullable="false" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="cmin" Attno="-4" Mdid="0.29.1.0" Nullable="false" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="xmax" Attno="-5" Mdid="0.28.1.0" Nullable="false" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="cmax" Attno="-6" Mdid="0.29.1.0" Nullable="false" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="tableoid" Attno="-7" Mdid="0.26.1.0" Nullable="false" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
          <dxl:Column Name="gp_segment_id" Attno="-8" Mdid="0.23.1.0" Nullable="false" ColWidth="4">
            <dxl:DefaultValue/>
          </dxl:Column>
        </dxl:Columns>
        <dxl:IndexInfoList/>
        <dxl:Triggers/>
        <dxl:CheckConstraints/>
      </dxl:Relation>
    </dxl:Metadata>
    <dxl:Query>
      <dxl:OutputColumns>
        <dxl:Ident ColId="1" ColName="a" TypeMdid="0.28.1.0"/>
      </dxl:OutputColumns>
      <dxl:CTEList/>
      <dxl:LogicalInsert InsertColumns="1">
        <dxl:TableDescriptor Mdid="6.20432.1.0" TableName="t1_x">
          <dxl:Columns>
            <dxl:Column ColId="17" Attno="1" ColName="a" TypeMdid="0.28.1.0" ColWidth="4"/>
            <dxl:Column ColId="18" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
            <dxl:Column ColId="19" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
            <dxl:Column ColId="20" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
            <dxl:Column ColId="21" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
            <dxl:Column ColId="22" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
            <dxl:Column ColId="23" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
            <dxl:Column ColId="24" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
          </dxl:Columns>
        </dxl:TableDescriptor>
        <dxl:UnionAll InputColumns="1;9" CastAcrossInputs="false">
          <dxl:Columns>
            <dxl:Column ColId="1" Attno="1" ColName="a" TypeMdid="0.28.1.0"/>
          </dxl:Columns>
          <dxl:LogicalGet>
            <dxl:TableDescriptor Mdid="6.20432.1.0" TableName="t1_x">
              <dxl:Columns>
                <dxl:Column ColId="1" Attno="1" ColName="a" TypeMdid="0.28.1.0" ColWidth="4"/>
                <dxl:Column ColId="2" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
                <dxl:Column ColId="3" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
                <dxl:Column ColId="4" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
                <dxl:Column ColId="5" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                <dxl:Column ColId="6" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                <dxl:Column ColId="7" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                <dxl:Column ColId="8" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
              </dxl:Columns>
            </dxl:TableDescriptor>
          </dxl:LogicalGet>
          <dxl:LogicalGet>
            <dxl:TableDescriptor Mdid="6.20432.1.0" TableName="t1_x">
              <dxl:Columns>
                <dxl:Column ColId="9" Attno="1" ColName="a" TypeMdid="0.28.1.0" ColWidth="4"/>
                <dxl:Column ColId="10" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
                <dxl:Column ColId="11" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
                <dxl:Column ColId="12" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
                <dxl:Column ColId="13" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                <dxl:Column ColId="14" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                <dxl:Column ColId="15" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                <dxl:Column ColId="16" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
              </dxl:Columns>
            </dxl:TableDescriptor>
          </dxl:LogicalGet>
        </dxl:UnionAll>
      </dxl:LogicalInsert>
    </dxl:Query>
    <dxl:Plan Id="0" SpaceSize="1">
      <dxl:DMLInsert Columns="0" ActionCol="16" CtidCol="0" SegmentIdCol="0">
        <dxl:Properties>
          <dxl:Cost StartupCost="0" TotalCost="431.010432" Rows="1.000000" Width="4"/>
        </dxl:Properties>
        <dxl:DirectDispatchInfo/>
        <dxl:ProjList>
          <dxl:ProjElem ColId="0" Alias="a">
            <dxl:Ident ColId="0" ColName="a" TypeMdid="0.28.1.0"/>
          </dxl:ProjElem>
        </dxl:ProjList>
        <dxl:TableDescriptor Mdid="6.20432.1.0" TableName="t1_x">
          <dxl:Columns>
            <dxl:Column ColId="17" Attno="1" ColName="a" TypeMdid="0.28.1.0" ColWidth="4"/>
            <dxl:Column ColId="18" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
            <dxl:Column ColId="19" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
            <dxl:Column ColId="20" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
            <dxl:Column ColId="21" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
            <dxl:Column ColId="22" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
            <dxl:Column ColId="23" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
            <dxl:Column ColId="24" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
          </dxl:Columns>
        </dxl:TableDescriptor>
        <dxl:Result>
          <dxl:Properties>
            <dxl:Cost StartupCost="0" TotalCost="431.000016" Rows="1.000000" Width="8"/>
          </dxl:Properties>
          <dxl:ProjList>
            <dxl:ProjElem ColId="0" Alias="a">
              <dxl:Ident ColId="0" ColName="a" TypeMdid="0.28.1.0"/>
            </dxl:ProjElem>
            <dxl:ProjElem ColId="16" Alias="ColRef_0016">
              <dxl:ConstValue TypeMdid="0.23.1.0" Value="1"/>
            </dxl:ProjElem>
          </dxl:ProjList>
          <dxl:Filter/>
          <dxl:OneTimeFilter/>
          <dxl:Append IsTarget="false" IsZapped="false">
            <dxl:Properties>
              <dxl:Cost StartupCost="0" TotalCost="431.000013" Rows="1.000000" Width="4"/>
            </dxl:Properties>
            <dxl:ProjList>
              <dxl:ProjElem ColId="0" Alias="a">
                <dxl:Ident ColId="0" ColName="a" TypeMdid="0.28.1.0"/>
              </dxl:ProjElem>
            </dxl:ProjList>
            <dxl:Filter/>
            <dxl:RandomMotion InputSegments="0,1,2" OutputSegments="0,1,2">
              <dxl:Properties>
                <dxl:Cost StartupCost="0" TotalCost="431.000013" Rows="1.000000" Width="4"/>
              </dxl:Properties>
              <dxl:ProjList>
                <dxl:ProjElem ColId="0" Alias="a">
                  <dxl:Ident ColId="0" ColName="a" TypeMdid="0.28.1.0"/>
                </dxl:ProjElem>
              </dxl:ProjList>
              <dxl:Filter/>
              <dxl:SortingColumnList/>
              <dxl:TableScan>
                <dxl:Properties>
                  <dxl:Cost StartupCost="0" TotalCost="431.000006" Rows="1.000000" Width="4"/>
                </dxl:Properties>
                <dxl:ProjList>
                  <dxl:ProjElem ColId="0" Alias="a">
                    <dxl:Ident ColId="0" ColName="a" TypeMdid="0.28.1.0"/>
                  </dxl:ProjElem>
                </dxl:ProjList>
                <dxl:Filter/>
                <dxl:TableDescriptor Mdid="6.20432.1.0" TableName="t1_x">
                  <dxl:Columns>
                    <dxl:Column ColId="0" Attno="1" ColName="a" TypeMdid="0.28.1.0" ColWidth="4"/>
                    <dxl:Column ColId="1" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
                    <dxl:Column ColId="2" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
                    <dxl:Column ColId="3" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
                    <dxl:Column ColId="4" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                    <dxl:Column ColId="5" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                    <dxl:Column ColId="6" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                    <dxl:Column ColId="7" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
                  </dxl:Columns>
                </dxl:TableDescriptor>
              </dxl:TableScan>
            </dxl:RandomMotion>
            <dxl:RandomMotion InputSegments="0,1,2" OutputSegments="0,1,2">
              <dxl:Properties>
                <dxl:Cost StartupCost="0" TotalCost="431.000013" Rows="1.000000" Width="4"/>
              </dxl:Properties>
              <dxl:ProjList>
                <dxl:ProjElem ColId="8" Alias="a">
                  <dxl:Ident ColId="8" ColName="a" TypeMdid="0.28.1.0"/>
                </dxl:ProjElem>
              </dxl:ProjList>
              <dxl:Filter/>
              <dxl:SortingColumnList/>
              <dxl:TableScan>
                <dxl:Properties>
                  <dxl:Cost StartupCost="0" TotalCost="431.000006" Rows="1.000000" Width="4"/>
                </dxl:Properties>
                <dxl:ProjList>
                  <dxl:ProjElem ColId="8" Alias="a">
                    <dxl:Ident ColId="8" ColName="a" TypeMdid="0.28.1.0"/>
                  </dxl:ProjElem>
                </dxl:ProjList>
                <dxl:Filter/>
                <dxl:TableDescriptor Mdid="6.20432.1.0" TableName="t1_x">
                  <dxl:Columns>
                    <dxl:Column ColId="8" Attno="1" ColName="a" TypeMdid="0.28.1.0" ColWidth="4"/>
                    <dxl:Column ColId="9" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
                    <dxl:Column ColId="10" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
                    <dxl:Column ColId="11" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
                    <dxl:Column ColId="12" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                    <dxl:Column ColId="13" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                    <dxl:Column ColId="14" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                    <dxl:Column ColId="15" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
                  </dxl:Columns>
                </dxl:TableDescriptor>
              </dxl:TableScan>
            </dxl:RandomMotion>
          </dxl:Append>
        </dxl:Result>
      </dxl:DMLInsert>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
